And David danced before the LORD with all his might; and David was girded with a linen {g} ephod.

(g) With a garment like the priest's garment.

Wesley's Notes

6:14 Danced - To express his thankfulness to God by his outward carriage, according to the manner of those times. Linen ephod - The usual habit of the priests and Levites, in their sacred ministrations yet sometimes worn by others, as it was by the young child Samuel; and so David, who laid by his royal robes, and put on this robe to declare, that although he was king of Israel, yet he willingly owned himself to be the Lord's minister and servant.

Jamieson-Fausset-Brown Bible Commentary

14. David danced before the Lord-The Hebrews, like other ancient people, had their sacred dances, which were performed on their solemn anniversaries and other great occasions of commemorating some special token of the divine goodness and favor.

with all his might-intimating violent efforts of leaping, and divested of his royal mantle (in a state of undress), conduct apparently unsuitable to the gravity of age or the dignity of a king. But it was unquestionably done as an act of religious homage, his attitudes and dress being symbolic, as they have always been in Oriental countries, of penitence, joy, thankfulness, and devotion. [See on [265]1Ch 15:27.]

Matthew Henry's Concise Commentary

6:12-19 It became evident, that happy was the man who had the ark near him. Christ is indeed a Stone of stumbling, and a Rock of offence, to those that are disobedient; but to those that believe, he is a Corner-stone, elect, precious, 1Pe 2:6-8. Let us be religious. Is the ark a blessing to others' houses? We may have it, and the blessing of it, without fetching it away from our neighbours. David, at first setting out, offered sacrifices to God. We are likely to speed in our enterprises, when we begin with God, and give diligence to seek peace with him. And we are so unworthy, and our services are so defiled, that all our joy in God must be connected with repentance and faith in the Redeemer's atoning blood. David attended with high expressions of joy. We ought to serve God with our whole body and soul, and with every endowment and power we possess. On this occasion David laid aside his royal robes, and put on a plain linen dress. David prayed with and for the people, and as a prophet, solemnly blessed them in the name of the Lord.